Heterotrophic nitrification by Alcaligenes faecalis links organic and inorganic nitrogen metabolism.

ABSTRACT: Heterotrophic nitrification remains a mystery for decades. It has been commonly hypothesized that heterotrophic nitrifiers oxidize ammonia to hydroxylamine and then to nitrite in a way similar to autotrophic AOA and AOB. Recently, heterotrophic nitrifiers from Alcaligenes were found to oxidize ammonia to hydroxylamine and then to N2 ("dirammox", direct ammonia oxidation) by the gene cluster dnfABC with a yet-to-be-reported mechanism. The role of a potential glutamine amidotransferase DnfC clues the heterotrophic ammonia oxidation might involving in glutamine. Here, we found Alcaligenes faecalis JQ135 could oxidize amino acids besides ammonia. We discovered that glutamine is an intermediate of the dirammox pathway and the glutamine synthetase gene glnA is essential for both A. faecalis JQ13

SUBMITTER: Qin YL 

PROVIDER: S-EPMC11440038 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature